DC METERING CIRCUITS

Chapter 8 DC METERING CIRCUITS

Lessons In Electric Circuits Volume I – DC Book
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Lessons In Electric Circuits Volume I – DC Book

  • Chapter 8DC METERING CIRCUITSContents 245,8.1 245,What 245,is 245,a 245,meter?. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 235 251,8.2 251,Voltmeter 251,design . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 241 256,8.3 256,Voltmeter 256,impact 256,on 256,measured 256,circuit. . . . . . . . . . . . . . . . . . . . . 246 263,8.4 263,Ammeter 263,design . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 253 270,8.5 270,Ammeter 270,impact 270,on 270,measured 270,circuit . . . . . . . . . . . . . . . . . . . . . . 260 274,8.6 274,Ohmmeter 274,design . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 264 279,8.7 279,High 279,voltage 279,ohmmeters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 269 287,8.8 287,Multimeters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 277 292,8.9 292,Kelvin 292,(4-wire) 292,resistance 292,measurement . . . . . . . . . . . . . . . . . . . . 282 299,8.10 299,Bridge 299,circuits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 289 306,8.11 306,Wattmeter 306,design . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 296 307,8.12 307,Creating 307,custom 307,calibration 307,resistances . . . . . . . . . . . . . . . . . . . . 297 310,8.13 310,Contributors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3008.1What is a meter?A meteris any device built to accurately detect and display an electrical quantity in a formreadable by a human being. Usually this ”readable form” is visual: motion of a pointer ona scale, a series of lights arranged to form a ”bargraph,” or some sort of display composedof numerical figures. In the analysis and testing of circuits, there are meters designed toaccurately measure the basic quantities of voltage, current, and resistance. There are manyother types of meters as well, but this chapter primarily covers the design and operation of thebasic three.Most modern meters are ”digital” in design, meaning that their readable display is in theform of numerical digits. Older designs of meters are mechanical in nature, using some kindof pointer device to show quantity of measurement. In either case, the principles applied in235